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Network Security Pen-Test
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Re: PPPOE password sniffing

from [alexpheno] Network Security [Permanent Link]
Subject: Re: PPPOE password sniffing
Date: 27 Jan 2007 21:42:52 -0000 
If you're using PAP as an authentication scheme you must look into the
packets that follow the PPPOE session, after you've found a PPPOE
access concentrator a PPP session is established. You must look for a
packet that is sent by the authenticating terminal (in this case your
computer)  to the concentrator. Try to do a wireshark capture and
apply this filter rule "pap and eth.src==XX:XX:XX:XX:XX:XX", and
replace the x part with the terminal's mac address. If a frame matches
the filter it should contain the user and password in the payload.

Check out RFC1334 for more info.
--
Alex Nedelcu
CCNA, SNRS, CSVPN

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